What is the meaning of seal?

noun

• Fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters.
  • synonyms: sealing wax
• A device incised to make an impression; used to secure a closing or to authenticate documents.
  • synonyms: stamp
• The pelt or fur (especially the underfur) of a seal.
  • usage: "a coat of seal"
  • synonyms: sealskin
• A member of a Naval Special Warfare unit who is trained for unconventional warfare.
  • usage: "SEAL is an acronym for Sea Air and Land"
  • synonyms: Navy SEAL
• A stamp affixed to a document (as to attest to its authenticity or to seal it. )
  • usage: "the warrant bore the sheriff's seal"
• An indication of approved or superior status.
  • synonyms: cachet, seal of approval
• A finishing coat applied to exclude moisture.
• Fastener that provides a tight and perfect closure.
• Any of numerous marine mammals that come on shore to breed; chiefly of cold regions.

verb

• Make tight; secure against leakage.
  • usage: "seal the windows"
  • synonyms: seal off
• Close with or as if with a seal.
  • usage: "She sealed the letter with hot wax"
• Decide irrevocably.
  • usage: "sealing dooms"
• Affix a seal to.
  • usage: "seal the letter"
• Cover with varnish.
  • synonyms: varnish
• Hunt seals. .